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Title: Roto-Seal Meters And Transfer Proving
Author: J. L. Pond
Source: 1970 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1970
Abstract: The original rotary meters, developed in the 1920s, consisted of two oppositely rotating impellers of two-lobe or figure 8 contour, operating within a rigid casing having inlet and outlet gas connections on opposite sides. Impeller contours were of a form which provides a continuous line seal between the impellers and the body wall at all positions during rotation. The impellers do not push against each other clearance between

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